This document discusses money markets and various money market securities. It begins by defining money market securities as debt securities with maturities of one year or less. It then profiles the key characteristics of popular money market instruments including Treasury bills, commercial paper, negotiable certificates of deposit, repurchase agreements, federal funds, and banker's acceptances. The document also examines how these securities are used by institutional investors to manage short-term cash and facilitate the flow of funds. It provides details on pricing models and yields for different money market products.